No environment texture but there is one in the reflections
You can see the built in HDRI by going to Material Preview, and turning up &quot;World Opacity&quot; under viewport shading options.

If you want to use one of the &quot;preview&quot; HDRI's that came with blender as a render-able HDRI, you can find them (.exr files) in the blender folder at ../2.82/datafiles/studiolights/world. The default (likely the one you saw) is forest.exr. Connect it to your world shader as an environment texture.
If you want other options, there are many free places to obtain them online. One of the most popular is HDRI Haven (https://hdrihaven.com/hdris/).